US3919811A - Grinding wheel for forming a facet on the periphery of an eyeglass lens - Google Patents

Grinding wheel for forming a facet on the periphery of an eyeglass lens Download PDF

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Publication number
US3919811A
US3919811A US463997A US46399774A US3919811A US 3919811 A US3919811 A US 3919811A US 463997 A US463997 A US 463997A US 46399774 A US46399774 A US 46399774A US 3919811 A US3919811 A US 3919811A
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United States
Prior art keywords
grinding
grinding wheel
wheel
facet
lens
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Expired - Lifetime
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US463997A
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English (en)
Inventor
Lars Hedelin
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Individual
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Individual
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Publication date
Priority claimed from SE7305793A external-priority patent/SE7305793L/xx
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
    • B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
    • B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
    • B24B9/14—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms

Definitions

  • This invention refers to a method for grinding around the periphery of an eyeglass lens a facet which axially-is located at or near to the front curvatureofuthe lens and a grinding wheel construction for carrying-out the method.
  • the main object of the invention thus resides in ob: taining a fully automatical niethodenabling the opera tor to grind a facet which follows the front curvature of the lens independent of the thickness of the lens and the curvature thereof.
  • FIG. 1 is a section through a lens and an active part of two grinding wheels for grinding the facet, at an early stage of grinding.
  • FIG. 2 is a similar section but illustrating the end stage of the grinding operation
  • FIG. 3 is a similar section showing the grinding wheels and the finished lens separated
  • FIG. 4 is a view similar to that of FIGS: 1 3 but illustrating the grinding of a so called mini -facet, in an initial locating stage of grinding
  • FIG. 5 shows the parts in a second locating stage
  • FIG. 6 shows the parts in the final locating stage
  • FIG. 7 shows in its upper part a minifacet-grinded lens and in its lower part the composite grinding wheel for carrying out the grinding operation.
  • the axial localisation of the facet is carried out automatically in that the lens is continuously guided relative to the grinding wheel as sembly comprising two grinding sections in the axial di rection thereof as a consequence of different grinding capacities of the grinding wheel parts which generate the different facet surfaces.
  • Said difference in grinding ability is obtained by a careful matching of the amount of grinding particles such as diamond powder and the binding medium between the two grinding wheel sections.
  • the grinding wheel assembly comprises two coaxial grinding wheels 1, 2, which are arranged in a face to face relationship upon the same driving shaft.
  • Each grinding wheel has a sloping grinding surface 3, 4 for generating the facet surfaces 5, 6 of the lens 7.
  • the grinding wheel 1 is made up in such a way that it will have a lower grinding wheel 1 is made up in such a way that it will have a lower grinding capacity than the grinding wheel 2.
  • said wheel I has a relative grain density of approximately 115 150 71 whereas the wheel 2 has a grain density of approximately 70 7c.
  • the grinding grains may consist of a mixture of diamond grains and grains of carbide or oxide types. When a high percentage of another mate rial than diamond, for example carbide grains is chosen the relative hardness of the bonding in the grinding track should also be higher. Best suited as bonding media are metal alloys with a base consisting of FE,
  • the facet point 8 will be axially located in deipendance of the, relation between the amount of glass 9* that the left grinding track 3 has ground awayand'the amount 10 which th'eright grinding track 4 has ground away during the same time.
  • the facet surface 5 will by this arrangement constantly be narrower than the facet surface 6 so that the point 8 of the facet will be located closer to the front curvature ll of the lens tharito the inner, rear curvature 12.
  • the face t surfaces form therebetween an angle of When lenses thicker'than 3mm are to be provided with facets a special facet design, named mini-facet is used. In such mini-facets the width of the facet is limited to three mm and the rest of the lens is ground cylindrical.
  • FIGS. 4 7 the arrangement according to FIGS. 4 7 is used.
  • the left hand grinding wheel 13 has a surface 14 which is inclined relative to the horizontal reference plane in the drawing about l.5 -2 the lower portion being located to the right in the drawing.
  • the facet grinding surface of wheel 13 is designated 15.
  • the right hand grinding wheel 16 has also a surface 17 which is inclined 1.5- 2 relative to the horizontal reference plane the lower portion being located at the left in the drawing.
  • the facet grinding surface of wheel 16 is designated 18. Furthermore the surface 14 of the left hand grinding wheel has a diameter which is somewhat bigger (preferably 0.4 0.5 mm) than that of the surface 17 of the right hand grinding wheel.
  • the lens first contacts the grinding surface 14 of the grinding wheel 13 as illustrated in FIG. 4 the inclination of said surface brings the lens to be displaced to the right and owing to the bigger diameter of said grinding surface the grinding surface 17 is initially out of contact with the lens.
  • the lens will consequently take the correct position as shown in FIG. 6 and the balance between the ground off amounts of glass insures that the facet will have its correct position entirely independent of the variations in lens thickness from one point to another.
  • FIG. 7 the ground off amounts 20 and 21 of each grinding wheel are illustrated and the shape of the ground lens as well as of the grinding wheel assembly is also illustrated.
  • the grinding of a mini-facet has heretofore been a cumbersome work only possible to be carried out by I specialists but according to this invention the work is carried out fully automatical without any intervening action whatsoever from the operator during the grinding operation.
  • Lenses of varying dippter strength and having thicknesses from approximately 1 mm up to for instance 12 mm may be automatically grinded.
  • the axial guiding of the lens relative to the grinding wheels in a dynamically balanced grinding operation is therefore of utmost importance.
  • the grinding wheel assem bly may consist of one single wheel with two grinding 3 tracks or two separate grinding wheels.
  • a grinding'wheel for grinding around the periphery of a relatively thick eyeglass lens a facet which is axially located at or near to the front curvature of the lens comprising two grinding tracks for grinding the facet, one of said tracks having a higher grinding capacity than the other track, said lens and said grinding track being mounted floatingly in axial direction relative to each other said grinding tracks being situated on the periphery of at least one grinding wheel.
  • said grinding wheel being profiled to generate at least one of the facet surfaces and that said wheel has a first slightly sloping peripheral conical surface which continues to a second sloping surface, said wheel having a groove between said sloping surfaces.
  • said first sloping surface 4. being capable of guiding the lens into said groove for forming the facet.
  • a grinding wheel construction according to claim 1 wherein the diameter of said first slightly sloping surface, of said wheel having the less grinding capacity somewhat exceeding the diameter of the corresponding part of the other sloping surface of said grinding wheel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Eyeglasses (AREA)
US463997A 1973-04-25 1974-04-25 Grinding wheel for forming a facet on the periphery of an eyeglass lens Expired - Lifetime US3919811A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7305793A SE7305793L (it) 1973-04-25

Publications (1)

Publication Number Publication Date
US3919811A true US3919811A (en) 1975-11-18

Family

ID=20317290

Family Applications (1)

Application Number Title Priority Date Filing Date
US463997A Expired - Lifetime US3919811A (en) 1973-04-25 1974-04-25 Grinding wheel for forming a facet on the periphery of an eyeglass lens

Country Status (6)

Country Link
US (1) US3919811A (it)
JP (1) JPS5052695A (it)
DE (1) DE2420083C3 (it)
FR (1) FR2227088B1 (it)
GB (1) GB1472282A (it)
IT (1) IT1010767B (it)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2148159A (en) * 1983-10-18 1985-05-30 Essilor Int Process and apparatus for bevelling or grooving ophthalmic lenses
US5329735A (en) * 1992-06-08 1994-07-19 Charlton Thomas J System for forming and polishing grooves in glass panels
US5542876A (en) * 1994-08-19 1996-08-06 Coburn Optical Industries, Inc. V-profile grinding wheel
US5626511A (en) * 1994-10-03 1997-05-06 National Optronics, Inc. Combination lens edger, polisher, and safety beveler, tool therefor and use thereof
WO1997018922A1 (fr) * 1995-11-23 1997-05-29 Briot International Meule perfectionnee pour verres ophtalmiques, et machine de meulage correspondante
US5658194A (en) * 1994-04-12 1997-08-19 Norton S.A. Super abrasive grinding wheels
US5865668A (en) * 1996-10-30 1999-02-02 Stewart; Ronald Shaper head for making mouldings
US5882247A (en) * 1996-07-22 1999-03-16 Briot International Machine for grinding of optical glasses
US5964652A (en) * 1996-08-14 1999-10-12 Siemens Aktiengesellschaft Apparatus for the chemical-mechanical polishing of wafers
US20030176155A1 (en) * 2002-03-13 2003-09-18 Wiand Ronald C. Two-part beveling wheel for improved positioning of bevel contours on ophthalmic lenses

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5843227B2 (ja) * 1980-02-13 1983-09-26 孝正 田窪 自動玉摺機

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3353303A (en) * 1964-11-13 1967-11-21 Ait Ind Inc Art of edging
US3520091A (en) * 1967-08-24 1970-07-14 Osmond Philip Raphael Method of grinding the edges of lenses
US3834089A (en) * 1972-02-14 1974-09-10 Raphaels Ltd Monowheel plastic lens edger

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3353303A (en) * 1964-11-13 1967-11-21 Ait Ind Inc Art of edging
US3520091A (en) * 1967-08-24 1970-07-14 Osmond Philip Raphael Method of grinding the edges of lenses
US3834089A (en) * 1972-02-14 1974-09-10 Raphaels Ltd Monowheel plastic lens edger

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2148159A (en) * 1983-10-18 1985-05-30 Essilor Int Process and apparatus for bevelling or grooving ophthalmic lenses
US4612736A (en) * 1983-10-18 1986-09-23 Essilor International Cie Generale D'optique Method and apparatus for bevelling or grooving ophthalmic lenses
US5329735A (en) * 1992-06-08 1994-07-19 Charlton Thomas J System for forming and polishing grooves in glass panels
US5658194A (en) * 1994-04-12 1997-08-19 Norton S.A. Super abrasive grinding wheels
US5542876A (en) * 1994-08-19 1996-08-06 Coburn Optical Industries, Inc. V-profile grinding wheel
US5626511A (en) * 1994-10-03 1997-05-06 National Optronics, Inc. Combination lens edger, polisher, and safety beveler, tool therefor and use thereof
FR2741560A1 (fr) * 1995-11-23 1997-05-30 Briot Int Meule perfectionnee pour verres ophtalmiques, et machine de meulage correspondante
WO1997018922A1 (fr) * 1995-11-23 1997-05-29 Briot International Meule perfectionnee pour verres ophtalmiques, et machine de meulage correspondante
US5882247A (en) * 1996-07-22 1999-03-16 Briot International Machine for grinding of optical glasses
US5964652A (en) * 1996-08-14 1999-10-12 Siemens Aktiengesellschaft Apparatus for the chemical-mechanical polishing of wafers
US5865668A (en) * 1996-10-30 1999-02-02 Stewart; Ronald Shaper head for making mouldings
US20030176155A1 (en) * 2002-03-13 2003-09-18 Wiand Ronald C. Two-part beveling wheel for improved positioning of bevel contours on ophthalmic lenses
US6758733B2 (en) * 2002-03-13 2004-07-06 Ronald C. Wiand Two-part beveling wheel for improved positioning of bevel contours on ophthalmic lenses

Also Published As

Publication number Publication date
JPS5052695A (it) 1975-05-10
GB1472282A (en) 1977-05-04
AU6831574A (en) 1975-10-30
FR2227088A1 (it) 1974-11-22
DE2420083B2 (de) 1979-05-17
IT1010767B (it) 1977-01-20
DE2420083C3 (de) 1980-01-31
DE2420083A1 (de) 1974-11-07
FR2227088B1 (it) 1978-07-07

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